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  CrusherThe Patent Description & Claims data below is from USPTO Patent Application 20070284465. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001]1. Field of the Invention [0002]The present invention relates to a crusher capable of efficiently crushing target materials to be crushed. [0003]2. Description of the Related Art [0004]For the purposes of mainly promoting reuse of waste materials and reducing the volume thereof, crushers are employed to crush various kinds of materials to be crushed. Some of those crushers are used to crush primarily cut limbs and timbers from thinning, which are generated with land development, maintenance and other operations made in forests, branches generated by trimming trees cut in forests, and scrap woods generated with pulling-down of wooden houses, etc. [0005]One known such crusher includes a feed conveyor for conveying target materials, which are loaded to be crushed, toward a crushing chamber, a pressing roller for pressing the target materials to be crushed from above, which are conveyed on the feed conveyor, a crushing bit for crushing the target materials introduced by cooperation of the feed conveyor and the pressing roller, and a screen (sieve member) for discharging the materials having been crushed outward of the crushing chamber while selecting the grain size of the crushed materials. Further, in one example of that type of crusher, the crushing bit smashes against the target materials to be crushed from below, which are introduced to the crushing chamber while being gripped by the feed conveyor and the pressing roller, thereby crushing the target materials (see, e.g., U.S. Pat. No. 5,947,395). SUMMARY OF THE INVENTION [0006]With the crushing method of smashing the crushing bit against the target materials to be crushed from below as in the above-described technique, the target materials can be crushed into finer chips when a point (support point) where the target materials to be crushed are pressed and supported from above at the time of smashing by the crushing bit is positioned closer to a point (smashing point) where the crushing bit smashes against the target materials to be crushed. In the above-described technique, the support point where the target materials to be crushed are supported is a contact point between the pressing roller and the target materials. In trying to position the support point closer to the smashing point, however, there is a limit because of the problem with mechanical layout, e.g., the arrangement of the pressing roller and a crushing rotor. With the above-described technique, therefore, the support point and the smashing point tend to locate away from each other, whereby the target materials cannot be finely crushed and are roughly crushed by the crushing bit. Accordingly, in some cases, a longer time is required until the roughly-crushed target materials are finely crushed, and the crushed materials having relatively large sizes are discharged through the screen as they are. This may result in lowering of the crushing efficiency and a reduction in grain size quality of the crushed materials. [0007]An object of the present invention is to provide a crusher capable of efficiently producing crushed materials with good grain size quality. [0008]To achieve the above object, according to a first aspect, the present invention provides a crusher comprising a crushing rotor being rotatable and having a crushing bit to crush target materials to be crushed; a feed conveyor for conveying the target materials toward the crushing rotor; and a pressing feeder unit including a pressing roller disposed above the feed conveyor and introducing the target materials on the feed conveyor toward the crushing rotor while pressing the target materials from above, and a fixed bit disposed at a position which is closer to the crushing rotor than a point where the pressing roller presses the target materials and which is outward of the crushing rotor in the radial direction, the fixed bit having a bumping surface, against which the target materials bump, disposed in an opposed relation to the rotating direction of the crushing bit, thereby crushing the target materials introduced toward the crushing rotor. [0009]According to a second aspect, in the crusher according to the first aspect, the bumping surface of the fixed bit is preferably arranged at a level not lower than the height of a lower end portion of the pressing roller during crushing operation. [0010]According to a third aspect, in the crusher according to the first aspect, the fixed bit is preferably replaceable with another type of fixed bit. [0011]According to a fourth aspect, in the crusher according to the third aspect, a gap size from a part of the fixed bit closest to the crushing rotor to a maximum locus of rotation of the crushing bit is preferably adjustable by replacing the fixed bit with another type of fixed bit. [0012]To achieve the above object, according to a fifth aspect, the present invention provides a crusher comprising a crushing rotor being rotatable and having a crushing bit to crush target materials to be crushed; a feed conveyor for conveying the target materials toward the crushing rotor; and a pressing feeder unit including a pressing roller disposed above the feed conveyor and introducing the target materials on the feed conveyor toward the crushing rotor while pressing the target materials from above, and a support-point constituting portion disposed at a position closer to the crushing rotor than a point where the pressing roller presses the target materials, the support-point constituting portion acting, when the crushing bit smashes against the target materials introduced toward the crushing rotor, to press the target materials toward the feed conveyor side. [0013]To achieve the above object, according to a sixth aspect, the present invention provides a crusher comprising a crushing rotor being rotatable and having a crushing bit to crush target materials to be crushed; a feed conveyor for conveying the target materials toward the crushing rotor; a pressing feeder unit including a pressing roller disposed above the feed conveyor and introducing the target materials on the feed conveyor toward the crushing rotor while pressing the target materials from above, and a first fixed bit disposed at a position which is closer to the crushing rotor than a point where the pressing roller presses the target materials and which is outward of the crushing rotor in the radial direction, the first fixed bit having a bumping surface, against which the target materials bump, disposed in an opposed relation to the rotating direction of the crushing bit, thereby acting, when the crushing bit smashes against the target materials introduced toward the crushing rotor, to press the target materials toward the feed conveyor side for crushing of the target materials; and a second fixed bit disposed at a position downstream of the first fixed bit in a direction in which the target materials are forced to move and which is outward of the crushing rotor in the radial direction, the second fixed bit having a bumping surface, against which the target materials bump, disposed in an opposed relation to the rotating direction of the crushing bit, thereby further crushing the target materials having been crushed by the first fixed bit. BRIEF DESCRIPTION OF THE DRAWINGS [0014]FIG. 1 is a side view of a crusher according to a first embodiment of the present invention; [0015]FIG. 2 is a plan view of the crusher according to the first embodiment of the present invention; [0016]FIG. 3 is a side view showing a structure in the vicinity of a crushing apparatus provided in the crusher according to the first embodiment of the present invention; [0017]FIG. 4 is a side view showing a state of the structure shown in FIG. 3 during the crushing operation; [0018]FIG. 5 is a side view showing a structure in the vicinity of the crushing apparatus provided in a crusher according to a modification of the first embodiment of the present invention; [0019]FIG. 6 is a side view showing a state of the structure shown in FIG. 5 during the crushing operation; [0020]FIG. 7 is a side view showing a structure in the vicinity of the crushing apparatus provided in a crusher according to a second embodiment of the present invention; [0021]FIG. 8 is a side view showing a structure in the vicinity of the crushing apparatus provided in a crusher according to a first modification of the second embodiment of the present invention; Continue reading... Full patent description for Crusher Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Crusher patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Crusher or other areas of interest. ### Previous Patent Application: Rock grinding mill and method Next Patent Application: Drag device for spinning reel Industry Class: Solid material comminution or disintegration ### FreshPatents.com Support Thank you for viewing the Crusher patent info. IP-related news and info Results in 0.44581 seconds Other interesting Feshpatents.com categories: Qualcomm , Schering-Plough , Schlumberger , Seagate , Siemens , Texas Instruments , |
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